Stencil-plate



NrTED STATES ELTWEED POMEROY, OF NEWARK, NEW JERSEY, ASSIGNOR TO THE POMEROY DUPLIOATOR COMPANY, OF NEW JERSEY.

STENCIL-PLATE.

SPECIFICATION forming part of Letters Patent No. 601,479, dated. March 29, 1898.

Application filed March 16, 1396.

To all whom it may concern.-

Be it known that '1, ELTWEED POMEROY, a

' citizen of the United States, residing at Newark, in the county of Essex'and State of New Jersey, have invented a certain new and useful Improvement in Stencil-Plates, of which the following is a specification.

My invention relates to that class of stencil-plates which comprise a base of an open veil-like material, preferably of paper, an example of which is the well-known Japanese paper called yoshino in Japan and dental paper in this country, which base is providedwith a coating of such a nature as to be readily removable by the pressure of the writing implement from the openings of the base without destroying, when written upon with ordinary care, the threads or fibers crossing the line of writing to such an extent as to cut out the centers of loop letters.

More particularly my invention relates to the coating for such stencil-plates, and it depends upon the discovery that by treating pure paraffin by heat in a vessel closed eX- cept for a small vent the nature of the paraffin will be altered and what I may term its ftoughness be altered, as Well as its melting-point lowered.

In carrying out my invention'I take, for example-fifteen pounds of paraffin having a high melting-point-as, for instance, 135 or 140 Fahrenheit-and place the same in a closed vessel having a small tube or vent eX- tending from its top. The contents of the vessel are, then treated for from an hour and a half to four hours, according to the intensity of the fire beneath. The paraffin appears to boil vigorously and throw off fumes and vapors, and I have found that gener ally a small explosion occurs shortly after the paraffin is heated. For this reason I prefer and recommend that the operation be Serial No. 583,455. (No model.)

carried on in the open air. To determine when the operation has been carried sufficiently far, a small quantity of the paraffin is poured from the vessel and its meltingpoint taken. lowered one or two degrees, the treatment is considered finished. After one has had some experience in performing this operationthe point where treatment is carried sufficiently far can be determined by the'appearance and color of the boiling paraffin. The product differs in its structure from the original paraffin treated in that it is less coherent or more friable and more oily. clear a color.

A base such as yoshino-paper coated with this coating will be found to work-as a stencil-plate in a very superior manner to pure paraffin of the original melting-point of the coating, giving a stencil in which the liability of cutting out the centers of loop letters is almost if not entirely eliminated.

I claim- It also does not have as If the melting-point has been 1. A stencil-plate having a base substanduction in consistency, toughness and melting-point from paraffin, substantially as described.

This specification signed and witnessed this 9th day of March, 1896.

ELTW EED POMEROY.

Witnesses:

EUGENE CoNRAN, JOHN R. TAYLOR. 

